Rajan Wilcox
Replacing the fuel pump on a 1990 Blazer is a challenging task that requires careful planning and execution. The fuel pump is located inside the fuel tank, and accessing it may require removing the tank or cutting a hole in the floor of the vehicle. With the right tools and knowledge, it is possible to replace the fuel pump yourself, saving on labour costs. However, it is important to use genuine GM parts to avoid issues with faulty or premature failure. The process involves relieving the fuel system pressure, removing the sending unit/pump assembly, installing a new assembly, and reconnecting the hoses and electrical connections.
| Characteristics | Values |
|---|---|
| Difficulty | Hard |
| Location of fuel pump | Inside the fuel tank |
| Access | Requires removal of the fuel tank unless there is an access plate in the floor of the Blazer |
| Tools | Wrenches, jack, punch, hammer, shop rag, Schrader valve |
| Parts | Genuine GM parts are recommended |
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What You'll Learn
The fuel pump is located inside the fuel tank
Replacing the fuel pump on a 1990 Blazer is a challenging task. The fuel pump is located inside the fuel tank, which means that if your Blazer does not have an access plate in the floor, you will need to remove the tank to get to the pump.
Before attempting to replace the fuel pump, it is important to relieve the fuel system pressure. This can be done by removing the pump relay, wrapping a shop rag around the Schrader valve, and depressing the stem inside.
Once the fuel system pressure has been relieved, you can begin the process of removing the old fuel pump and installing the new one. This involves disconnecting the hoses and electrical connections, removing the sending unit/pump assembly from the tank, and placing the new assembly in the tank. It is important to note that you should always use genuine GM parts when replacing your fuel pump assembly, as aftermarket fuel pumps have been known to cause problems.
With the new assembly in place, you can secure it by turning the locking ring clockwise with a punch and hammer. You will then need to lift the tank to reconnect the hoses and electrical connections before reinstalling the mounting straps, shield, and filler hose. Finally, you can lower your Blazer to the ground and reinstall the battery cable.
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You may need to cut a hole in the floor to access the pump
Replacing the fuel pump on a 1990 Blazer is a challenging task that may require cutting a hole in the floor to access the pump. The fuel pump is located inside the fuel tank, and if your model does not have an access plate in the floor, the tank will need to be removed to reach the pump.
Before attempting any repairs, it is essential to relieve the fuel system pressure by removing the pump relay, wrapping a shop rag around the Schrader valve, and depressing the stem inside. This will prevent any accidental fuel leaks or engine damage.
If your Blazer does not have an access plate, you may need to cut a hole in the floor to reach the pump. This hole should be big enough to fit wrenches and allow access to the hoses and hard lines. It is important to know exactly where to cut, as making a mistake could require you to drop the tank anyway.
Once you have cut the hole and accessed the pump, you can begin the removal process. Disconnect the hoses and electrical connections, and remove the mounting straps and shield. Lift the tank with a jack to provide enough clearance to work.
With the tank lifted, you can now remove the sending unit/pump assembly from the tank. Place the new assembly in the tank and secure it by turning the locking ring clockwise with a punch and hammer. Reinstall the mounting straps and shield, and reconnect the hoses and electrical connections. Lower the Blazer to the ground and reinstall the battery cable.
Finally, turn the key to the "run" position without cranking to allow the new pump to prime. Your Blazer should now be running much better with its new fuel pump.
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Relieve the fuel system pressure
To relieve the fuel system pressure, park your Blazer on level ground and remove the pump relay. Wrap a shop rag around the Schrader valve and depress the stem inside.
The fuel pump for the 1990 full-size Blazer is located inside the fuel tank. If there is no access plate in the floor of the Blazer, the tank will have to be removed to get to the pump. You will need to cut a hole in the trunk/floor to access the pump, but be aware that you may still need to drop the tank. It is important to know exactly where to cut the hole, as you will need to be able to get wrenches on the hoses that are screwed to the hard lines.
Once you have accessed the pump, you will need to remove the sending unit/pump assembly from the tank. Place the new assembly in the tank and secure it by turning the locking ring clockwise with a punch and hammer.
With the jack, lift the tank far enough to connect the hoses and electrical connections. Reinstall the mounting straps and shield, and reconnect the filler hose to the fuel tank. Your Blazer can now be lowered to the ground and the battery cable can be reinstalled.
Turn the key to the run position without cranking for a second to allow the new pump to prime. Your Blazer should crank right up and run much better with its new fuel pump. It is important to always use genuine GM parts when replacing your fuel pump assembly, as many people have reported problems with aftermarket fuel pumps.
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Remove the sending unit/pump assembly
To remove the sending unit/pump assembly from a 1990 Blazer, you will first need to relieve the fuel system pressure. Do this by removing the pump relay, wrapping a shop rag around the Schrader valve and depressing the stem inside.
The fuel pump for the 1990 full-size Blazer is located inside the fuel tank. If your model does not have an access plate in the floor of the Blazer, then the tank will have to be removed to get to the pump. You will need to cut a hole in the trunk/floor, but be aware that this may not be enough to access the pump.
Once you have access to the pump, you will need to disconnect the hoses and electrical connections. You will also need to remove the mounting straps and shield.
The sending unit/pump assembly is now ready to be removed from the tank. You will need to use a wrench to loosen the lock ring and then pick the sending unit/pump up out of the tank.
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Reinstall the mounting straps and shield
To reinstall the mounting straps and shield, follow these steps:
First, place the new assembly in the tank and secure it by turning the locking ring clockwise with the punch and hammer. Next, use the jack to lift the tank far enough to connect the hoses and electrical connections. Then, reinstall the mounting straps and shield, and reconnect the filler hose to the fuel tank.
Your Blazer can now be lowered to the ground and the battery cable can be reinstalled. Finally, turn the key to the run position without cranking for a second to allow the new pump to prime.
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Frequently asked questions
The fuel pump is located inside the fuel tank.
If your 1990 Blazer does not have an access plate in the floor, you will need to remove the tank to get to the pump.
You will need a jack, a punch, a hammer, and a wrench. You will also need a factory service manual to test the ohm and voltage loads.
Yes, with the right tools and some assistance, you can replace the fuel pump yourself and save money on labour costs.
Many people have reported problems with aftermarket fuel pumps, including faulty parts and premature failure. It is recommended to always use genuine GM parts when replacing your fuel pump assembly.
